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academies
Materials Science and Nanotechnology | Volume 2
May 21-22, 2018 | New York, USA
International Conference on
Nanoscience & Technology
I
n this talk we emphasized on a detailed investigation of
the structural, optical, and magnetic properties of pure
and Ni-doped SnO
2
nanoparticles (NPs) synthesized by a sol-
gel process. An extensive structural study has been carried
out using various characterization techniques. The X-ray
Diffraction (XRD) spectra show the formation of the single
phase tetragonal structure of pure and Ni-doped SnO
2
NPs
without any noticeable impurity phase such as NiO. XRD
results revels that the crystallite size of SnO
2
is found to be
decreased with Ni doping, which has also been confirmed by
the Field Emission Scanning Electron Microscopy study. X-ray
Photoelectron Spectroscopy (XPS) measurements displayed a
clear sign for Ni
2+
ions occupying the lattice sites of Sn
4+
in the
SnO
2
host which also gives clear evidence for the formation
of single phase Sn1-xNixO
2
NPs. The optical analysis shows
a significant decrease in the energy gap of SnO
2
, (i.e., from
3.71 eV to 3.28 eV) as Ni concentration increases which
may be correlated with the core level valence band XPS
analysis. Photoluminescence studies show that Ni doping
creates oxygen vacancies due to dissimilar ionic radii of Ni
2+
and Sn
4+
. Superconducting quantum interference device
measurements revealed that the Ni doped SnO
2
NPs exhibit
strong ferromagnetic behavior at room temperature and
this analysis has been well fitted with a simple relationship
to find out magnetic parameters proposed by Stearns and
Cheng et al. Hence, our results demonstrate that Ni-doping
has strong impact on the structural, optical, and magnetic
properties.
e:
pushpendratripathi05@gmail.comImproved room temperature ferromagnetism in Ni doped SnO
2
nanoparticles: A detailed study
Tripathi P
Aligarh Muslim University, India